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A304267 as a simple table

na(n)
18
27
319
450
5146
6404
71074
82990
98316
1022660
1162314
12172244
13473150
141300260
153582364
169857308
1727108012
1874607826
19205320218
20564864078
211554286696
224277060278
2311768341874
2432381151240
2589101629960
26245170898378

[8,7,19,50,146,404,1074,2990,8316,22660,62314,
 172244,473150,1300260,3582364,9857308,27108012,
 74607826,205320218,564864078,1554286696,
 4277060278,11768341874,32381151240,89101629960,
 245170898378]